Assets at the six largest U.S. banks are up 37% from five years ago. What happened?

FORTUNE -- One third of all business loans this year were made by Bank of America. Wells Fargo funds nearly a quarter of all mortgage loans. And held in the vaults of JPMorgan Chase is $1.3 trillion, which is 12% of our collective cash, including the payrolls of many thousands of companies, or enough to buy 47,636,496,885 of these NFL branded toaster ovens. Thanks for your business!

A number of large banks and Wall Street firms have disappeared. There are new regulations in the works meant to limit risky trading and bring derivatives that compounded the financial system's losses into regulated markets. Subprime lending has been coming back recently, but it's still a fraction of what it once was.